This puzzle:

Notepad: The grid represents a maze. Enter the room at the upper left and exit at the lower right, following a path that will become apparent as you solve the crossword. When the puzzle is done, read the circled letters in the order in which the rooms are visited to spell a quote by 153-Across.

JimH notes: Following the doors from room to room, the circles spell out the EMERSON quote, "EVERY WALL IS A DOOR." Patrick Merrell created this nice graphic.